I think that one is in the wrong catagory. I think that came out on 72 or so and I never saw a Mach I with a pipe. I think they were relagated to the sports catagory by the time tuned pipes were being used.
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I have the Mach 1 article, (June 1973). The plane came out sometime about 1971, and had a aftermarket muffler and retracts. I think the Mach 1 has beautiful lines, but have never seen one fly in SPA. The most successful SPA planes have generous size wing areas to lower the wing loading with the 4-strokes--this explains the popularity of the Daddy Rabbits